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Ankle Equinus

Structural and Postural Conditions· Also known as: equinus deformity, ankle equinus deformity, restricted ankle dorsiflexionUpdated Nov 2026

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At a Glance

In ankle equinus, the ankle has limited upward bending, often because of tight calf muscles. It was found in 96.5 per cent of people who saw a podiatrist with a new foot or ankle problem, but that is a clinic figure, not a figure for everyone. It is often subtle or silent, so you may not notice it. If the equinus is flexible, physical therapy and stretching at home often do the job.

What is it?

Ankle equinus means your ankle doesn't bend upward as far as it should. The movement is called dorsiflexion (bending your foot up towards your shin). You may also hear it called restricted ankle dorsiflexion.

It often happens when the calf muscles are too tight. These are the gastrocnemius (the larger calf muscle) and the soleus (the deeper calf muscle). When they are tight, they pull hard on the Achilles tendon, which attaches to your heel bone, and this limits how far your ankle can bend.

There is no agreed amount of lost movement that counts as ankle equinus. Cut-offs of under 10, under 5 and under 0 degrees are all used, so whether you are given the label depends on the definition your clinician uses. It is fine to ask your podiatrist which one they are using.

Who does it affect?

Ankle equinus is very common among people who see a podiatrist with a new foot or ankle problem. That is a clinic figure, so it doesn't tell you how common it is in the general population. How common it is in otherwise healthy people isn't known, though it may be more common than most people think.

Toe walking is one sign of it in children. Toe walking is much more common in young children with neuropsychiatric or developmental delays than in those who are developing normally.

In adults with diabetes, limited ankle bend is linked with higher pressure under the feet. The effect is small. This link is often seen in people with diabetes, especially those who have had a foot ulcer from nerve damage. This is a link, not proof that ankle equinus causes ulcers.

Signs and symptoms

The form of ankle equinus that affects otherwise healthy people, without a nerve or muscle disease behind it, is often called subtle or silent. Because it is often called subtle or silent, it may not be obvious.

In children with idiopathic toe walking, reduced ankle movement is linked to difficulty keeping their heels down when squatting. Children with idiopathic toe walking have reduced ankle movement both when the foot is moved for them and when they move it themselves.

What pain people feel, and where, isn't clear yet. A podiatrist can check your ankle movement even if you have no obvious symptoms. For warning signs, see the "When to see a podiatrist" section below.

What causes it?

Ankle equinus can have a few different causes.

It can come from tight or shortened calf muscles, or tightness in the soft tissues around the ankle. Bone or joint restriction can also limit how far the ankle bends. Neuromuscular conditions (conditions that affect the nerves and muscles) can cause it too.

In children, the most common causes are cerebral palsy and idiopathic toe walking (toe walking with no known cause). Children who toe walk this way show differences in how they process sensations. It isn't known whether those differences cause the toe walking or result from it.

People with diabetes can develop nerve damage. This can shrink the nerve that supplies the muscles lifting the ankle.

Tight calf muscles may play a part in many adult foot and ankle problems that develop over time without an injury, though this isn't proven. Excess weight, footwear, hard floors and a sedentary life may contribute mainly by making the calf tighter, though this isn't proven. It isn't clear yet whether these are direct causes.

How is it diagnosed?

A podiatrist diagnoses ankle equinus by examination. In the Silfverskiöld test, they measure your ankle bend with the knee straight, then bent. Under 5 degrees straight but over 10 bent points to a tight gastrocnemius; under 10 bent suggests the whole calf is tight.

The weight-bearing lunge test gives consistent results between clinicians. Changes under about 4.6 to 4.7 degrees are within measurement error. Measuring with the foot rolled in can overstate the bend by up to 10 degrees.

Limited bend isn't assumed to be simple calf tightness. Impingement at the back of the ankle and diabetic nerve changes can also limit it.

In children, toe walking is told apart from cerebral palsy by comparing examination findings, walking and muscle patterns. An MRI may be considered if there is developmental delay or abnormal nerve findings.

Treatment

In flexible ankle equinus, physical therapy and home stretching are often all that is needed.

Looking after it at home

Start with guided stretching and strengthening, plus home exercises. There is no single best amount of stretching, so ask your podiatrist to set a plan and a time to review it. Avoid flat shoes. Rocker-soled shoes (curved soles) are general ankle advice, not specific to equinus. With diabetes and a risk of foot ulcers, experts advise checking both feet before exercising, 15 days after starting, then monthly.

Treatment from your podiatrist

Your podiatrist can guide your exercises and advise on footwear, orthoses (shoe inserts) and activity. Adult care usually tries reassurance, lifestyle change, footwear and physiotherapy before surgery. Stretching can increase ankle bend in healthy people, though it may not make a clear difference if you have diabetes and equinus.

Surgery

After other care hasn't helped, gastrocnemius recession (a calf-lengthening operation) may be considered. It is most likely to help adults with chronic plantar fasciitis (long-lasting heel pain) and an isolated tight gastrocnemius, where combining it with stretching can give better long-term function and less pain than stretching alone. It isn't certain to beat non-surgical care for everyone. This may not apply to other causes or to children. For other adult problems it is less clear whether surgery helps, though it may help pain from overload in the middle or front of the foot. In children with cerebral palsy it is well established.

Keyhole recession usually increases how far the ankle can bend upward. Complications are uncommon: calf weakness 3.5 per cent, nerve injury 3.0 per cent, wound problems 1.0 per cent, 7.5 per cent overall. For adults having the operation for plantar fasciitis, around 1 in 12 get a complication, usually swelling or pain that settles within a year.

Serial casting can cause pressure sores or ulcers. Lengthening can cause calcaneus gait (a changed walk) and calf weakness. If you have a cast or a surgical wound, the "When to see a podiatrist" section lists what to watch for.

Ask whether a tight gastrocnemius is the problem and whether to see a foot and ankle surgeon, and about technique and risks. With diabetes, asthma or high blood pressure, you may need an assessment visit 2 to 6 weeks before surgery.

Recovery

Flexible ankle equinus often settles with physical therapy and stretching at home. How long that takes isn't clear yet, and there is no sure way to tell in advance who will do best with this kind of care. Keep up the home exercise programme your podiatrist sets, and ask for a time to review how it is going.

After calf-lengthening surgery, build your activity up gradually once the bandage or plaster is off. Start with walking or cycling. Most people are back to their previous level within 3 to 4 months. The tightness can return in about 1 in 20 people, usually much milder than before, and only a few need more surgery.

Preventing it

It isn't clear whether calf stretching stops ankle equinus from developing.

For people with diabetes, limited ankle bend may add to the pressure under the foot that leads to ulcers. This may matter even without nerve damage. Look after your feet each day, treat any early skin damage (such as a callus or blister), and never walk without suitable foot protection. Wear properly fitting therapeutic footwear (shoes made to ease pressure). Footwear that relieves pressure helps stop ulcers coming back.

When to see a podiatrist

When to book

Book an appointment with your podiatrist if:

your pain hasn't improved after a few weeks of home care
you have diabetes and your yearly foot check is due, or you have had a foot ulcer before

When to get help sooner

Get urgent medical assessment (see your GP today, or go to an urgent care clinic or the nearest emergency department) if:

your cast is loose, too tight, cracked, dented, soft, wet or smelly, is rubbing, or has discharge or blood coming through it
you have had foot surgery and the wound opens, keeps bleeding or starts to leak
you have diabetes, poor circulation or reduced feeling in your feet and notice a new wound, sore, blister or colour change on your foot, or a sore that isn't healing
you have diabetes or reduced feeling in your feet and one foot becomes red, hot or swollen, or suddenly changes shape, even if it doesn't hurt (possible Charcot foot)
you feel a sudden snap or pop at the back of your ankle or calf, as if you were kicked, and then find it hard to push off or stand on tiptoe

See your GP soon if:

you have lost weight without trying
you have pain at night or at rest that doesn't settle

See your podiatrist or GP soon if:

you have new numbness, tingling, pins and needles or weakness in your foot that has come on gradually
your child walks on tiptoe and also can't stand with heels down, has one side different from the other, has very bulky calves, or seems unusually stiff or unsteady
your pain is getting worse, or doesn't settle with rest, less activity or pain relief

Frequently asked questions

Is a tight calf always a problem?

Not necessarily. The usual view is that a tight gastrocnemius (the larger calf muscle) is an abnormal tightening. It may instead just be a normal limit on how long that muscle is. This isn't settled yet.

What happens in a weight-bearing lunge test?

It is an easy test that can be repeated reliably. You lean forward over your foot while standing, and your podiatrist measures how far your ankle bends. It is used to check for a tight gastrocnemius, in clinics and in research.

Can calf-lengthening surgery help Achilles tendon pain in adults?

It is less clear whether surgery helps here than for some other problems. For pain in the middle of the Achilles tendon, the support is limited. For pain where the tendon meets the heel bone, it isn't clear yet whether surgery helps or not.

What do 'tight gastrocnemius' and 'tight whole calf' mean?

A tight gastrocnemius means only the larger calf muscle is tight. A tight whole calf means the deeper soleus muscle is tight too. Your podiatrist tells them apart by measuring your ankle bend with the knee straight and then bent.